You had me until you started mentioning all the other black characters that have brought into the movies. I agree that Falcon was a good character to bring into Winter soldier. I agree that Jackson did a great job as Fury. I'm in 'wait and see' mode for Black Panther, but I can see that turning out well, given Marvel Studios' recent history. That has fuck all to do with deciding what Spider-Man to bring into the movies.
If Marvel or Sony decide to bring in Morales because he's a good character with a compelling story, great. If they bring him in because they think that Parker is a bit played out, I'll disagree, but fine. If they bring him in because 'we need more black superheros,' then I would say that their priorities are backwards. Diversity is a fine thing, and shouldn't be ignored, but it shouldn't be the reason that decisions like this get made.